Blackhorn209--I'd say save your money. I called my new ML manufacturer to see if I needed a different breechplug for BH & shotshell 209 primers. They said no. Bought CCI 209M primers. Tested 4 BH209 loads--14 shots total. Had two hangfires and one FTF. Never had either in years of using 777/ML primers of different brands. None of the tested BH groups were very accurate. Only positive things about BH: velocities were consistent (but less velocity per grains than advertised), and cleanup was easier (but still fairly dirty after 3 shots). Best barrel cleaner for BH seemed to be good ol Hoppe's # 9